Abstract
A series of sulfonated polyimide copolymers as novel proton exchange materials were synthesized by the polycondensation of 1,4,5,8-naphthalene-tetracarboxylic dianhydride (NTDA), sulfonated diamine based on pyridine group and diamine containing N-phenyl-1,2,4-triazole moiety. Flexible, transparent and tough membranes with high thermal stability and good mechanical properties were obtained. They exhibited good stability in boiling water and Fenton’s reagent at 80 °C. More interestingly, a nonlinear relationship between proton conductivities of the resulting membranes and the degree of sulfonation (DS) was observed. The membrane with 50% DS exhibited the maximum proton conductivity, which was due to the combinational contributions of sulfonic acid and N-pheny-1,2,4-triazole groups. Thus, the N-phenyl-1,2,4-triazole moiety in this study not only can depress water absorption but also increase proton conductivity, especially at low DS.
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Lei, R., Gao, Lx., Jin, Rz. et al. Sulfonated polyimides containing 1,2,4-triazole groups for proton exchange membranes. Chin J Polym Sci 32, 941–952 (2014). https://doi.org/10.1007/s10118-014-1460-7
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DOI: https://doi.org/10.1007/s10118-014-1460-7